Apparatus for burning powdered fuel



Feb. .22 1927,

' 1,618,808 E. BURG APPARATUS. FOR BURNING POWDERED FUEL Filed March 211925 /"i WL I literacy Patented Feb. 22, 1927.

UNITED STATES PATENT OFFIQ/E.

' EUGEN BUR-G, OI ESSEN-ON-THE RUHB, GERMANY- APPABA'1US FOR BURNINGPOWDERED FUEL.

Application filed March 21, 1925, Serial No. 17,163, and in GermanyMarch 28, 1924.

My invention relates to improvements in apparatus for burning powderedfuel,. and 'the object of the improvements is to provide an apparatusin' which the efliciency of the combustion and the life of the apparatusare increased. With this object in view my invention consists inproviding a combustion chamber which is provided at one end with meansfor supplying powdered fuel, and which has air for supporting combustlonsupplied thereto through passages IDEIClP III the side wall of thechamber and in a direction circumferential of the jet of powdered fuelflowing through said chamber. In the preferred form of the invention thesupply of the powdered fuel'is made such as to 1mpart to the jet of fuela whirling path For the purpose of explaining the invention, an exampleembodying the same has .been shown invthe accompanying drawing, in whichthe same reference characters have been used in all the views toindicate corresponding parts In said drawing.

Fig. 1 is a sectional elevation of the apparatusas used in connectionwith a steam boiler, and v p Fig. 2 is a section taken on theiline 2-2of Flg. 1.

- In theexample shown in the drawing the in combustion apparatuscomprises a combustion chamber 1 having a cylindrical wall 2 made fromrefractory material. At one end of the. said chamber a tubular inlet 4of annular cross-section opens into the com- ?5 bust-ion chamber. saidinlet having an intake pipe 6 and including a helical vane 5 adaptcd toimpart whirling movement to the fuel. The wall 2 of the chamber isprovided with transverse passages 3 for the admission of to air forsupporting combustion, and in the example shown inthe figures and moreparticularly in Fig. 1, the direction of the said passages and thehelical passage provided by the vane 5 are such that the air and the ffuel are whirled around within the combustion chamber in the samedirection. But I wish it to be understood that I do not limit myself tothis'feature, and that in some cases I dispose the saidpassages'relatively to eachother in such a way that air and-fuel arewhirled around in opposite directions. The central part of thetubularmember 4 has a cross-sectional area such as to permit accesstherethrough to the combastion chamber, and it is normally closed by agate 7. At the end opposite to the fuel .inlet the combustion chamber isprovided with a bottom discharge 8 for ashes, sa1d discharge beinglocated adjacent tothe fire tube ,9 of a steam boiler 10 adapted to beheated from the combustion chamber 1. The cylindrical wall 2 is providedwith a jacket 11, and the annular chamber 12 thus provided is divided bypartitions 13 into chambers, each of the chambers being connected withthe air supply main 14 by a pipe 15 comprising regulating means such asbutterfly valves 16. Further, each chamber has a supply of steam througha pipe 17 including a cock 18 and connected with a steam supply pipe 19.As appears more particularly from Fig. 1 the inner wall of the annularinlet flares outwardly at its delivery end, so that the fuel isdelivered into the combustion chamber in outward direction. l

In the operation of' the apparatus the fuel is admitted into thecombustion cham: ber 1 through the pipe 4 along a spiral path. and whenadmitted to the saidchamber it is thrown against the wall 2. Within thechamber it is mixed with the air admitted through the passages 3 intangential direction, and the mixture flows along a helical line ofsmall pitch towards the fire tube 9.

By centrifugal action the solid particles of the fuel are thrown towardsthe wall of the combustion chamber, so that they move along acomparatively long path while being continuously brought into contactwith fresh air. The volatile and readily ignited por tions move throughthe axial portion ofthe combustion chamber where their path iscomparatively short. The ashes are separated from the combustion gasesonly at the end of-thd combustion chamber and above the discharge 8,because earlier separation is prevented by the tangential current ofair. The air admitted through the wall of the chamber has a coolingaction,' so that the wall is in a less degree subject to thedestructiveaction of the heat. The steam admitted from the pipe 19 is heated withinthe wall i 2, and it is decomposed within the said wall stood that I donot limit myself to. the construction shown in the drawing.

I claim: 1. An agilparatus for the burning of powdered e1 comprising acylindrical retort having tangential slots through its cylindrical wall,a jacket extending about said cylindrical slotted wall and forming anannular air spaeetherewith, annular partitions for dividing said airspace into adjoining oompartments, an air supply under pressure to eachcompartment w lerehy to mtroduoe air through the tangential slots andinto the retort in a stream about the axis of the retort, and an annularinlet for the powdered material to the end of the retort andsubstantially coaxial therewith, said annular inlet havin anout-turned'inner portion for deflecting the powdered material toward thecylindrical slotted wall of the retort immediately on introduction ofthe material to the retort.

Y 2. An apparatus for the burning of powdered fuel comprising acylindrical retort having tangential slots through its cylindrical wall,a jacket extending about said cylindrical slotted walland forming anannular air s ace therewith, annular partitions for dividing said airspace into adjoining compartments, an air supply under ressure to eachcompartment whereby to introduce air through the tangential slots andinto the retort in a stream about the powdered materi to the end of theretort and substantially coaxial therewith, said annular inlet having anout-turned inner portion for deflecting the powdered material toward thecylindrical slotted wall of the retort immediately on introduction ofthe material to the retort and a spiral vane in said annular inlet forimpart-mg to the powdered material prior to introduction'into the retorta rotary movement about the axis of the retort. i

3. An a paratus for the burning of powdered uel comprising a cylindricalretort having tangential slots through its cylindrical wall, a jacketextending about said cylindrical slotted wall and forming an annular airs ace therewith, annular artitions'tfor divi ing said air space into ajoinmg compartments, an an supply under pressure to each compartmentwhereby to introduce air through the tangential slots and into theretort in a stream about the axis of the retort, an annular inlet forthe powdered material to the end of the retort and substantially coaxialtherewith, said annular inlet having an out-turned inner portion fordeflecting the wdered material toward the c lindrical s otted wall ofthe retort immediately on introduction of the partments.

In testimony whereotI hereunto aflix my signature.

' EUGEN BURG.-

